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74LS05 – Hex Inverter Open Coll

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One example is several devices with interrupt outputs feeding 74s05 a single interrupt pin on a microcontroller. But this way you don’t need to actually include the physical gate. Since the pull-up resistor is a fairly high value, this will not draw very much current, about 1 mA for a 4.

Push-pull outputs, which are in the 74LS04 drive the output high to the level of the power input of the chip, typically 5v or 3. Post as a guest Name. It looks like the 74,s05 has “open collector outputs” not sure what that is and the 04 does not.

Home Questions Tags Users Unanswered. They drive the output to ground to reflect a logic 0 this is called “sinking”. The 74LS05 is probably more expensive because there is much less demand for the chip. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Then when an interrupt occurs, the chip 74ks05 the interrupt will pull the line to ground. What’s the difference between a 74LS05 hex inverter and a 74LS04 hex inverter?

Datasheet: 74LS05

Well it allows the output of several chips to be tied together, and they won’t be interfering with each other all trying to drive the line high. Plus, it appears the 05 is more expensive? What good is that?

Regular push-pull outputs are used when only one output is driving one or more inputs, which is the case most of the time. KevinKeane Good point – I’ll add that to my answer. You can use them to turn a 12V light on and off by connecting the 74ls055 between 12V and the output. Sign up or log in Sign up using Google. How, if no output is driving it high?

The line into the microcontroller going to a logic 0 will be recognized as an interrupt — 7l4s05 this is caused by the line going from high to low, this is called an “active low” signal. Sign up using Facebook. Somewhere there will be a “pull-up resistor” common values are 4. When there is no interrupt, the line is high. As you pointed out, the 74LS05 has “open-collector” outputs and the 74LS04 does not.

74LS05 Datasheet(PDF) – Texas Instruments

One other way to look at it: If I recall correctly, at least some open collector outputs can accept higher voltages than 5. Excellent explanation for how OC works. Can someone tell me the difference between the two and when would you use one vs. There are two general types of outputs in digital circuitry: